DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-20
|Date of introduction:||1979||Display technology:||LCD|
|New price:||$33||Display size:||8 (5 + 2)|
|Size:|| 5.3" x 2.9" x
134 x 74 x 9 mm3
|Weight:||2.9 ounces, 82 grams||Serial No:|
|Batteries:||2*LR43||Date of manufacture:||wk 41 year 1980|
|AC-Adapter:||Origin of manufacture:||Italy|
|Program steps:||Courtesy of:||Stefan Klaes|
The TI-20 repeated an approach "invented" two years ago. Just like the lean TI-15 based on a fully loaded TI-30, this rare TI-20 is based on the TI-38.
First we should recall the TI-38. This odd calculator based on
the TI-35 and added some conversion functions instead of
the removed statistical capabilities.
And the TI-20 removed just this conversion functions ! What you get is the simplest member of all the slimline calculators.
Simply by comparing the designation of the integrated circuits of the calculators you'll get the first members of the slimline family:
|• TP0320 (CD3201)
• TP0320 (CD3202) TI-30-II
• TP0321 TI-50
• TP0322 TI-Business Analyst-II
• TP0323 TI-53
• TP0324 TI-35
• TP0326 TI-38 and TI-20
the TI-20 reveals a small surprise: The mold of the housing is identical to the
TI-38 and the keyplate covers three empty spaces for additional keys.
Even the keyboard holds the full array of 40 keys in 8 rows by 5 keys.
One owner of the rare TI-20 on the right discovered the hidden functions borrowed from the TI-38 and simply drilled three holes into the metal faceplate above the keyboard.
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© Joerg Woerner, January 6, 2002. No reprints without written permission.